optional

American  

[op-shuh-nl] / ˈɒp ʃə nl /

adjective

1. left to one's choice; not required or mandatory.

   Formal dress is optional.

   Synonyms:

   voluntary, elective, discretional

2. leaving something to choice.

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optional British  

/ ˈɒpʃənəl /

adjective

1. possible but not compulsory; left to personal choice

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Other Word Forms

• nonoptional adjective
• nonoptionally adverb
• optionality noun
• optionally adverb
• unoptional adjective
• unoptionally adverb

Etymology

Origin of optional

First recorded in 1755–65; option + -al ¹

Example Sentences

"I feel responsible. And I know I want children. I can no longer afford to take this kind of optional risk," she said.

From Barron's

In fact, he says they’re the reason Music Mogul AI includes optional consulting — one-on-one strategy sessions designed to complement the software.

From Los Angeles Times

Many apps suggest that users pay optional “tips” after they get their money, which can sometimes be difficult to opt out of.

From MarketWatch

"A lot of interactions are optional, and if you want to just play a fun game you can," she adds.

From BBC

But I also want to say this: in this country, we will not look away, we will not shrug our shoulders, and we will not allow the powerful to treat justice as optional.

From BBC